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Structural Void Filling Compound

3550 B/A FST

Product Description

3M™ Scotch-Weld™ Structural Void Filling Compound 3550 B/A FST (Fire

Smoke Toxicity) is a two-part, low-density, flame-retardant epoxy compound that

can be stored, applied, and cured at room temperature. Scotch-Weld 3550 B/A FST

Compound can be used for void-filling, edge-sealing, and complex gap-filling.

The cured material has meets FAR 25.853 (a) (d) and offers excellent water and

chemical resistance. It is designed for both metal and non metal honeycomb

sandwich constructions which are typically found in aircraft interior structures

such as galley structures, luggage bins, partition walls, lavatory structures, crew

rest compartments, seating structures, ceiling panels, doghouses, sidewall panels,

cargo bay panels, bar units, coatrooms and passenger doors. In these applications

the Scotch-Weld 3550 B/A FST Compound is used for honeycomb sandwich

structures as edge close-out, corner reinforcement, and local reinforcement for

mechanical fixation or complex gap-filling.

Material is available in 15L and 60L kits for use with bulk pumping equipment, and

also comes in cartridge form for gap-filling.

Features

• 100% solids

• Base is brown with black spots; accelerator is off-white

• Meets the flammability requirements of J.A.R./F.A.R. 25.853 (a) (d)

• Meets stand alone FST requirement

• Availability in duo-pack cartridges with static mixing nozzle or in bulk pumpable

kits

• Thixotropic properties for ease of application

• Good sag resistance

• Sandable & machinable within twelve hours at 75°F (23°C) of mixing or

1/2 hour at 175°F (80°C)

• Cures to a strong, low-density material within 48 hours at 75°F (24°C) or one

hour at 175°F (80°C)

• Service temperature of -65°F to 212°F (-55°C to 100°C)

• Seals honeycomb panel edges and provides impact resistance to panel

• Paintable

Technical Datasheet

March 2009